From: Larry Finger <Larry.Finger@lwfinger.net>
Date: Sun, 6 May 2012 21:01:05 +0000 (-0500)
Subject: b43legacy: Fix error due to MMIO access with SSB unpowered
X-Git-Tag: v3.4.1~27
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=46f736c6f722e9a71ab552178a6bf4edf85ba371;p=thirdparty%2Fkernel%2Fstable.git

b43legacy: Fix error due to MMIO access with SSB unpowered

commit 8f4b20388fa77226a3605627a33a23f90d559e50 upstream.

There is a dummy read of a PCI MMIO register that occurs before the SSB bus
has been powered, which is an error. This bug has not been seen earlier,
but was apparently exposed when udev was updated to version 182.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
index df7e16dfb36c5..a98db30b7acbe 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -1571,8 +1571,6 @@ static void b43legacy_request_firmware(struct work_struct *work)
 	const char *filename;
 	int err;
 
-	/* do dummy read */
-	ssb_read32(dev->dev, SSB_TMSHIGH);
 	if (!fw->ucode) {
 		if (rev == 2)
 			filename = "ucode2";